Clutch for roll-driving mechanism.



D. R. BOWEN. CLUTCH FOR ROLL DRIVING MECHANISM.

APPLICATION FILED JUNE 16. 1908.

Patented May 8, 1917.

2 SHEETS-SHEET 1 imam D. R.-BOWEN.

' CLUTCH FOR ROLL DRIVING MECHANISM. I

APPLICATION FILED JUNE 16. 1908.

1,2%5,39o Patented May 8,1917.

2 SHEETS-SHEET Z. 7%

fiwarzibrw DAVID B. BOWEN, 0F ANSONIA, CONNEC UNI a ran srans PATNT@FFEIQE.

TICUT, ASSIGN'OR T0 FARREL FCUNDBY &

MACHINE COMPANY, OF ANSONIA, CONNECTICUT, A CORPORATION OF CONNECTICUT.

CLUTCH FOR ROLL-DRIVING MECHANISM.

naaaaoa.

' Application filed .Tune 16 To all wkom is may Concern:

Be it known that I, DAVID R. BOWEN, a

citizen of the United States, residing at An- This-invention relates tocertain improvements in driving mechanism.

In driving the rolls of mil1s,.such, for instance, as rubber grinders,and other similar machines, it has been customary to mount a large gearon the shaft of one of the rolls and make this gear fast to the shaft,the,

shaft at its other end being intergeared with theshaft of the otherroll. This large gear was in turn driven by a relatively small. pinionwhich was arranged to be clutched to and unclutched from its drivingshaft by a positively acting lever operated clutch. In constructions ofthis character, great strains were set up on the driving mechanism instarting the mill, particularly when the mill was stopped with a mass ofmaterial between the rolls. Further, the positive clutch mechanism 'forthe small pinion was I located on the end of the shaft beyond thepinion, and the frame had to be constructed to provide a supporttherefor, thus extend ing the overall dimensions of the machine.Further, also, the prior machines were not provided with any adequateemergency stop mechanism. In such machines, and particularly inrubber-grinders, it is necessary at times and while the machine isrunning for the attendant to remove foreign bodies from the mass aboutto pass between the rolls. In doing this, the hand of the attendant isliable to be caught between the rolls, and unless the machine can beimmediately stopped, there is danger of severe injury.

It is the object of this invention to provide an improved drivingmechanism for the rolls of millsand similar machines in I which themachine may be readily stopped Specification of Letters Patent.

Patented May 8, rent.

, 1908. Serial No. 438,701.

and started, the severe strains set up in starting and stopping themachine being minimized. i

A further object of the invention is to produce an improved drivingmechanism for machines of the character referred to of such a characterthat the over-all dimensions of the machine may be decreased.

A further object of the invention is to produce an improved drivingmechanism for machines of the character referred to, said mechanismincluding devices by which the machine may be instantaneously stopped.

With these and other objects in view, the invention consists in certainconstructions,

binations as will be hereinafter fully described and then specificallypointed out in the claims. j

Referring to the drawingsproved driving mechanism, shown as applied to arubber grinding mill.

Fig. 2 is a side view of the driving mechanism of the machine, certainparts being shown in section, the position of the ob.- server beingindicated by the arrow 2 in Fig. 1.

Fig. 3 is adetail section.

" :oonstruction shown in Fig. 3.

'Fig. 5 is a section on the line 5-5 of the construction shown in Fig.4.

Fig. 6 is a detail view. I Referring to the drawings, the machine whichhas been selected to illustrate the in 'vention is, in its generalfeatures, a rubber grinding machine of the ordinary type, one of therolls of this machine being indicated, at 1, and the other beingindicated by dotted lines 2 in Fig. 1. These rolls may be mounted insuitable bearing boxes, as is usual, the box for the roll 1 being marked3 and the box for the roll 2 being indicated at 4, in Fig. 1, this boxbeing made adjustable by a screw, as is usual in such constructions. Inthe particular machine illustrated, the roll or shaft 1 is provided withand in certain parts, improvements and com- Fig. 4 is a section on theline 4-4 of the Figure 1 is an end elevation of the ima journal 6 whichextends through the box 3, and beyond this journal the endof the roll orshaft 1 is again reduced, as indicated at 7. The shaft driver which, asillustrated, consists of a relatively large driving gear 8, is mountedon the reduced part 7. This driving gear 8 is mounted to rotate looselyon the end of the roll 1, a clutch being provided to secure the driverto the roll or shaft 1 and to disconnect it therefrom, as circumstancesrequire. The driver is in turn operated by a pinion 5 fast on the powershaft 5 of the machine. In the best 1 constructions, the driver 8 willbe provided with a recessed hub 9 and the parts will be so arranged thatthe recess in the hub is located on the outside of the driver.

While the construction of the clutch employed may be varied, in the bestconstructions, it will be of such a character as to allow a slip of theshaft with respect to the clutch as the clutch is actuated. In theparticular construction illustrated, the part 7 of the roll or shaft 1is provided with a clutch drum 10, this clutch drum being suitablysecured by a key, or in any other suitable manner. The drum issurrounded by a coil clutch member 11, the construction being such thatthe convolutions of this member may be operated to grip or release theclutch drum.

While the arrangement of the clutch members with respect to the drivermay be varied, in the best constructions these parts of the clutch willbe arranged on the outside of the driver and will extend into a recessin the hub of the driver, this arrangement making for compactness of themechanism. While, furthermore, the means for connecting the coil memberof the clutch, when this form of clutch is employed, to the driver maybe varied, in the best constructions, and as shown, one endof the springmember is provided with a projection 12 which extends into a suitablerecess 13 in the hub of the driver, a wedge 14 being employed, ifdesired, to hold this projection in the recess, thus making fittingunnecessary.

The clutch actuating devices may be varied in construction, but, asshown, the hub of the driver is formed to provide a seat for a slidingcollar 15. This collar is surrounded by a split ring 16 from whichextend two pins 17. These pins pass through the ends of arms 18 mountedon a rockshaft 19 supported in suitable bearings in brackets 20 on theframe of the machine. The collar 15 is provided with two arnis 21, 22,the armv2l carrying a guide pin 23, and the arm 22 carrying a clutchoperating pin 24;. This clutch operating pin 24 is pivoted at 25 to oneof the arms 26 of a bell-crank lever 26, 27, pivoted at 28 to a bracket29 secured to the hub 9 of the driver. The arm 27 of the bell-crank 26,27 lies in a recess formed in an enlargement 30 on the free end of thecoil member of the clutch. 4

With this constrnction, it will be apparent that as the shaft 19 isrocked the collar 15 will be caused to slide on the hub of the driverand the connecting pin 24 will operate the bell-crank 26 to cause thespring member of the clutch to grip or release the clutch drum 10, asthe case may be, and thus connecting or disconnecting the driver fromits shaft.

The means for rocking the shaft to o crate the clutch may be variedwithin wide limits. In the particular construction shown, this shaft isprovided with an arm 31 which is acted upon by an operating member toeffect the rocking of the shaft and the movement of the collar. Theconstruction illustrated includes a threaded rod 32 supported in abracket 33 mounted on the frame of the machine. This rod, in theparticular construction shown, is arranged so that it may, under certaincircumstances, slide through the bracket and is kept from turning in thebracket by a pin 34 engaging a groove 35 in the end of the rod. The endof the rod not supported by the bracket 33 extends through a slottedopening 36 in the arm 31 before referred to. The particular operatingmember illustrated consists of a threaded nut 37 mounted on the threadedrod 32, this nut being conveniently formed as-the hub on hand-wheel 38.Under ordinary circumstances, the rod 32 is kept from sliding throughthe opening in the bracket by means of an abutment 39. With thisconstruction, it is apparent that as the hand wheel is rotated, in theproper direction, the nut 37 will be caused to engage the end of thelever 31 and push it over. This movement of the lever will rock theshaft 19, slide the collar and, through the bell-crank connections.before described, tighten the clutch coih gmthe'drum, so as to connectthe driver to the shaft. When the hand wheel nut is rotated intheopposite direction the nut'will travel away from the end of the lever31, thus permitting, the coil 11 to free itself from the drum 10, thisin turn causing the collar 15 to slide back. While the resiliency of thecoil might be depended upon to produce this freeing movement of the coiland collar, in the particular construction illustrated, the pin 23 isprovided with a spring 40 which assist'sin this action. The action sofardescribed is one which will take place during the ordinary operationof clutching or unclutching the driver from the shaft.

In the best constructions a release mechanism will be provided by whichthe driver may be instantaneously unclutched from the shaft, as, forinstance, when an operator has caught his hand in the, rolls, or whensome foreign body, as a bolt or stone, is observed in the mass about topass between the rolls which body cannot be removed without stopping themachine. The particular construction of this release mechanism may beconsiderably varied, but it should, however, include an actuator sodisposed with relation to the rolls that it may be conveniently,operated from all points along them. In the particular constructionillustrated, the abutment 39 is utilized as a part of this actuator andto this end is mounted on an arm 41 pivoted at 42 to the bracket 33before referred to. Connected to the arm 41 is a rod 43 extending alongthe rolls. The other end of this rod 43 may be supported by an arm 44pivoted at 45 to a bracket 46 on the frame of the machine. The arms 41may be extended, if desired, as shown, and counterweights 47 secured tothe ends of the arms. sired to instantaneously stop the machine, theoperator grasps the rod 43 and pulls it down. This moves the abutmentout from behind the end of the rod 32 and permits it to slide bodilythrough the bracket which movement in turn permits the movement of thearm 31 and the shaft 19 as before described.

' therefore, as a fly wheel. When the machine is to be restarted,therefore, the momentum of this gear will assist materially in startingthe rolls and the friction clutch will reduce the strains on themechanism in starting. Further, by arranging the'clutch mechanism asshown and by recessing the hub so that the clutch mechanism extends intoit an exceedingly compact mechanism is obtained and one in which theoperating mechanism cannot only be rocked conveniently from any part ofthe machine but is arranged on-"the roll side of the driver, thussimplifying the character of the operating connections.

Further, when ity is desired to stop the machine, this can be efi'ectedinstantaneously by the clutch releasing mechanism which operates todisconnect the large gear from the roll shaft, so that there is no suchtendency for the rolls to turn under the momentum of this gear acting asa fly wheel as there would be were this gear fast on its shaft and thedriving pinion disconnected by a clutch mechanism which, as beforepointed out, is the construction usually employed in machines of thischaracter.

Changes and variations may be made in the construction by which theinvention is carried into effect. The invention is not, therefore, to belimited to the specific construction herein described and illustrated inthe drawings With this construction, if it is de-' rock-shaft,anactuating member forthe rock-shaft, means for giving the actuatingmember a gradual movement in two dlrections to rock the rock-shaft, thusthrowing 1 the clutch into and out of operation, and

means for quickly releasing it to allow it" to move quickly in onedirection to'rock the shaft to throw the clutch out.

2. The combination with a driving pinion,

of a driven shaft, a relatively large gear operating also as a fly wheelloosely mounted on the shaft and arranged to drive the shaft, 4 I

a slip clutch connection betweien' the gear clutch. 1

557'- and the shaft, and means for operating the 3. The combination witha driving pinion,

of a driven shaft, a relatively large gear operating also as a fly wheelmounted on theshaft and arranged to drive the shaft, a slip clutchconnection between the gear and the shaft, means for operatingthe clutchto connect. it to and disconnect it from the shaft,

and anu'nstantaneous release mechanism for disconnecting the gear fromthe shaft.

The combination with a driven shaft, 7

of a relatively large gear operating also as a 'fiy wheel; on theshaftand arranged to drive the shaft, a coil clutch connection betweenthe gear and the shaft, means for operating the clutch to connect thegear to j and disconnect it from the shaft, and a release mechanismincluding an actuator accessible from points along the shaft forinstantaneously disconnecting the clutch from the shaft.

5. The combination with a driven shaft,

of a gear mounted on the shaft and arranged to drive said shaft, saidgear having a recessed hub, a clutch lying on one side of the hub andextending into the recess and arranged to release the shaft, a slidingcollar on the opposite side of the hub, connections between the collarand clutch extending through the gear, a lever for operating the collar,means including a screw and a hand operated nut for operating the lever,means for holding the screw against endwise movement, and an actuatorarranged to re lease the said screw-holding means.

6. The combination with a driven shaft, of a gear having a recessed hubmounted on said shaft and arranged to drive said shaft, a clutchnormally tending to open, said clutch lying on one side of the hub andextending into the recess, a sliding collar on the opposite side of thehub, connections between said collar and the clutch whereby tie are

the latter is operated by movements of the Cit collar, a lever foroperating the collar, :1 my hand, in the presence of twosubscribthreaded rod, a nut movable on the rod for ing witnesses.operating the lever, and means including a movable abutment whereby therod and nut 5 are .bodily movable to permit a; movement of lVitnesses:

the lever. H. J. DEvnNPoRT,

In testimony whereof, I have hereunto set C. L. DODGE.

' Copies ot this patent may be obtained for five cents each, byaddressing the Commissioner of Patents Washington, D. 0.

DAVID R. BOWEN.

